There are many areas which are still virgin in terms of taxonomic identification of important plants. My interest is to explore such areas. Is there any particular method to do such work?
You need to consult a series of varied books and journals from different disciplines of earth sciences to get an overview of this matter, supplemented with geobotany and biogeochemistry (e.g. classical book of "Geobotany and biogeochemistry in mineral exploration" by Brooks R.R. published in 1973, Harper and Row ) . As a journal I recommend "Journal of Geochemical Exploration" and "Geoderma". There are many examples which may help you. As far as I know the methods were successfully applied using Viscaria alpina a copper-indicating plant and namesake of the Viscaria Copper Mine near Kiruna, Sweden, which was discovered by this technique. Another example is Eagle Bluff Area in Alaska (see attached file), USA and the Murgul Region, Turkey, where they used Rhododendron ponticum for exploration on Cu and Au. In Germany, my ancestors made use of Viola calaminaria (yellow zinc viola) and Viola guestphalica (violet zinc viola).
Yeah you can do it by making a research group in different countries that will work together to explore the unidentified areas and can share their information